As I rifled through the racks at Catriona MacKechnie, my fingers came across the most unbelievably soft fabric. The light, gauzy pieces by Araks were navy-blue cotton edged with contrasting stretchy gray mesh. Both the bra and the rear of the panties had elastic, creating shirring down the centers of both, which made my butt look five times its actual size. Plus, the top was so thin and flimsy it offered absolutely no support. Catriona MacKechnie, 400 W. 14th St., nr. Ninth Ave.; 212-242-3200.